Classification — Odd Numbers
Q1: Find the odd one out in given series: 35 , 49 , 50 , 63 , 140
A. 35
B. 49
C. 50
D. 63
Answer: 50. Each of the number except 50, is divisible by 7.
Q2: Find the odd one out in given series: 21 , 39 , 51 , 63 , 83
A. 21
B. 39
C. 51
D. 83
Answer: 83. This is the only prime number in the group.
Q3: Find the odd one out in given series: 27 , 125 , 343 , 729 , 1321
A. 27
B. 125
C. 343
D. 1321
Answer: 1321. All other numbers are cubes of odd numbers.
Q4: Find the odd one out in given series: 45 , 99 , 109 , 126 , 207
A. 45
B. 99
C. 109
D. 126
Answer: 109. Each of the numbers except 109, is divisible by 9.
Q5: Find the odd one out in given series: 6 , 12 , 18 , 9 , 7.
A. 6
B. 12
C. 18
D. 7
Answer: 7. This is the only prime number in the group.